I can connect via ADB in recovery, and when I run dmesg, I see all sorts of nasty mmc0-related timeouts and errors. I can't even mount /system anymore. It's pretty clearly either an issue with the internal memory card or with the bus.
Does anyone have any idea how I can fix this or get it fixed? Of course, with an unlocked bootloader, I'm sure ASUS is going to give me all manner of grief and probably refuse to repair/replace what is clearly a hardware failure. Does anyone know if there's any way at all of replacing this kind of mmc card, or is it just part of the SoC? How screwed am I?
EDIT: Not screwed at all! See my post on page 2 for a fairly simple procedure to boot and run the tf701t (and quite probably many other devices) completely off of the SD card.